How to format string in core::stringc/w ?

[greenya]

I want to use only core::stringc/w , so can I do something like this ?:

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core::stringc a;
a.format( "count=%i", 10 );

if I will use char* I would wrote that in next way:

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char s[100];
sprintf( s, "count=%i", 10 );

But I want to do the same using only core::stringc/w, so the question is: how correctly (platform independently) format strings of types core:stringc/w ?

[LLDD]

Something like this should work:

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stringc a;
a.reserve(100);
sprintf(a.c_str(), "Count: %d", 10);

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[hybrid]

OMG, i hope not No, of course it won't work. c_str() returns a const char* string which is not writable. You'll have to use append and stuff to create your string. We do not have variable argument methods in Irrlicht, yet.

[lexchou]

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template<class T>
irr::core::string<T> format(const T * fmt,...)
 {
	 va_list va;
	 va_start(va,fmt);
	 T buffer[300];
	 _vstprintf(buffer,fmt,va);
	 va_end(va);
	 return buffer; 
 }

you can try this, but you need to include tchar.h first

examples:

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irr::core::stringw test=format(L"a=%d",1);
irr::core::stringc test=format("a=%d",1);

[greenya]

lexchou,
nice, Thank You.

[hybrid]

Yeah, indeed a nice function. But Windows-only. I think for a proper solution in Irrlicht we will need template specialization here... We have to use vsnprintf or vsnwprintf (resp. the _vs... versions from Microsoft). I wonder if VC6 will do this.